My ex is probably moving in a few months, so why am I not happy?

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My ex and I get along pretty well. We have our ups and downs, but doesn't every divorced couple? I always have 2 major issues with him: 1. He doesn't spend enough time with our son 2. He doesn't pay his child support in full He has been dating - long distance - someone who works in the same company. She lives half the country away from us and is quite a bit older. This morning - after offering to buy Starbucks, not only for me but my Hubby as well - he states that he is probably moving to this other state 2,500 miles away. We have been split up about 7 years. For the last 7 years we have fought, gotten along and I have been the one that he calls when he needed anything (from doctors appointments to picking up pictures at the photography studio). A piece of me is really glad that he has found someone who will hopefully take care of him (sort of weird to explain to people that you are friends with your ex and that he calls you for anything he needs), but I am worried about how all this will affect our son. My son already has issues with abandonment due to his Dad being gone in the military most of his life from birth to 4 years of age. On top of that, he lost everything - at his dads and at my parents house - during hurricane Katrina and he has been moved around a lot. He worries about everything too. Has anyone gone through this before? How did you kids managing the change?